GB1473878A - Telephone ringing circuits - Google Patents

Telephone ringing circuits

Info

Publication number
GB1473878A
GB1473878A GB2887874A GB2887874A GB1473878A GB 1473878 A GB1473878 A GB 1473878A GB 2887874 A GB2887874 A GB 2887874A GB 2887874 A GB2887874 A GB 2887874A GB 1473878 A GB1473878 A GB 1473878A
Authority
GB
United Kingdom
Prior art keywords
thyristor
frequency
ringing
june
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2887874A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PAYS G
Original Assignee
PAYS G
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PAYS G filed Critical PAYS G
Publication of GB1473878A publication Critical patent/GB1473878A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

1473878 Ringing circuits J M PERSON and J M GARNIER 28 June 1974 [28 June 1973] 28878/74 Heading H4K In a telephone ringing circuit an oscillator 3 operates a switch 4 to periodically discharge a capacitor 221 connected across a transducer 5, the capacitor being charged from rectified ring- ing current via a voltage doubler 1, and a constant current circuit involving Zener diode 223. The switch 4 is preferably a thyristor. The frequency at which the thyristor is switched determines the sound frequency produced, this frequency being governed by the control voltage of the thyristor and components 32, 33, 36, 37. Variable resistor 225 can be used as a volume control for the ringing signal.
GB2887874A 1973-06-28 1974-06-28 Telephone ringing circuits Expired GB1473878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7323710A FR2235556B1 (en) 1973-06-28 1973-06-28

Publications (1)

Publication Number Publication Date
GB1473878A true GB1473878A (en) 1977-05-18

Family

ID=9121721

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2887874A Expired GB1473878A (en) 1973-06-28 1974-06-28 Telephone ringing circuits

Country Status (4)

Country Link
US (1) US3919493A (en)
DE (1) DE2427042C3 (en)
FR (1) FR2235556B1 (en)
GB (1) GB1473878A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE435777B (en) * 1979-01-29 1984-10-15 Ibuki Kogyo Co Ltd ELECTRIC HORN
WO1981000657A1 (en) * 1979-08-20 1981-03-05 Western Electric Co Electronic tone ringer
US5172408A (en) * 1990-08-01 1992-12-15 At&T Bell Laboratories Speakerphone state-controlled alerting arrangement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3471651A (en) * 1967-01-13 1969-10-07 Ibm Telephone ringing circuit
US3539732A (en) * 1967-03-18 1970-11-10 Carlos Weissenberg Electronic system for signaling the entrance of telephone calls in multiline telephone sets
FR1581035A (en) * 1968-07-08 1969-09-12
US3536852A (en) * 1969-01-23 1970-10-27 Lorain Prod Corp Telephone interruption switching circuitry
US3603740A (en) * 1969-08-18 1971-09-07 Northern Electric Co Method and means for ringing a telephone subset
US3688038A (en) * 1971-04-12 1972-08-29 Stromberg Carlson Corp Stored energy signalling circuit

Also Published As

Publication number Publication date
FR2235556A1 (en) 1975-01-24
FR2235556B1 (en) 1978-09-08
DE2427042C3 (en) 1978-04-13
US3919493A (en) 1975-11-11
DE2427042B2 (en) 1977-08-18
DE2427042A1 (en) 1975-01-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee